This is a similar question earlier asked in RG
I fail to understand your question. Do you want to dislove Fe oxide nanoparticles? I think you want to suspend them in a fluid medium. In that case either you have charged them to provide Coulomb repulsion or coat them with a suitable surfactant to provide steric repulsion. One has to select surfactant so that its hydrocarbon tail be well weted in surrounding fluid.
yes, the question is already posed.. But as Prof Mehta mentioned it is important to clarify about dissolution and suspension. First one is related with sepparate the constituent ions, solvation, into a polar solvent or the molecules in a non polar solvent. Suspension means that the entire entity lets say a np is kept intact but supported by the suspension media. For nos usually,one is concerned about coalescence, agglomeration and rippening, so adequate measures to avoid them such as the use of suitable media, surfactants and capping agents must be conducted.
Please, check the following paper:
E. Amstad , et al., Ultrastable Iron Oxide Nanoparticle Colloidal Suspensions Using Dispersants with Catechol-Derived Anchor Groups, Nano Lett., 2009, 9 (12), pp 4042–4048.
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